Finding the Fourth Proportional to 56,591.76, 78,092.79 and 31,099.91

Step by Step Solution

1. Step 1: Write the proportion equation
   56,591.76 : 78,092.79 = 31,099.91 : x
2. Step 2: Convert to fraction form
   56,591.76/78,092.79 = 31,099.91/x
3. Step 3: Cross multiply
   56,591.76x = 78,092.79 × 31,099.91
4. Step 4: Simplify right side
   56,591.76x = 2,428,678,350.18
5. Step 5: Solve for x
   x = 2,428,678,350.18/56,591.76
6. Step 6: Final answer
   x = 42,915.76